<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Hello!</title>
        <style>
            #foo {
                color: brown;
                text-align: center;
            }

            .baz {
                color:red;
            }
        </style>
    </head>
    <body >
        <h1 id="foo">Welcome to my Web Page!</h1>
        <h1 class="baz">This is a second head.</h1>
        <h1 class="baz">This is a third head.</h1>
        Hello world!
    </body>
</html>